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When a glass panel plummets from a skyscraper, it's rarely a random accident—it's the result of complex material science, design decisions, and installation practices that converged to create failure. In this deep-dive investigation, we uncover the real reasons why glass falls from high-rise buildings. You'll learn about the infamous nickel sulfide (NiS) inclusions that can cause tempered glass to "explode" spontaneously, sometimes years after installation . We'll examine how edge damage during manufacturing or installation creates hidden stress concentrations, how thermal stress from uneven heating can shatter panels, and why poor frame design or missing setting blocks lead to glass-to-metal contact failures . Drawing on historical case studies—from Boston's John Hancock Tower, which lost over 2,000 panels, to recent incidents in Austin's ATX Tower—we'll show you how the industry has responded with better standards, heat-soaking protocols, and laminated glass requirements . Whether you're a facade engineer, architect, or building owner, understanding these failure mechanisms is the first step toward preventing the next "glass rain" incident. #FacadeEngineering #GlassBreakage #SkyscraperSafety #BuildingEnvelope #StructuralGlass